package com.singleton.type6.self;

public class Singleton06 {

}

class Singleton {

    public Singleton() {
    }

    public static volatile Singleton instance;

    public static Singleton getInstance(){
        if(instance==null){
            synchronized (Singleton.class) {
                if (instance == null) {
                    instance = new Singleton();
                }
            }
        }
        return instance;
    }

}
